Internal combustion engine



2 Sheets-Sheet l H. M. ROCKWELL INTERNAL COMBUSTION ENGINE Original Filed Oct. 7, 1925 Nov. 15, 1932.

YINVENTOR fla /1750mm? ATTORN EY Nov. 15, 1932, H. M. ROCKWELL 1,837,737

INTERNAL COMBUSTION ENGINE Original Filed. Oct. 7, 1925 2 Sheets-Sheet 2 z a g 1 M J|Y jm w v Z f m 1 V x 7 W 8 a .V fl I Z e H z 7 m? X 4 4 4 2 Q 5 V 0a w \a H w H l1 A V 4/ Z W x y x Patented Nov. 15, 1932 i. V i

UNITED STATE S' PATENT OFFICE:

INTERNAL comaus'rron ENGINE Reflle 6: application Serial No. e1,o7e,n1ea October 7; me.- This application filed ma a1, 1939.

Serial No. ,755. I v

This invention relates to internal combus the crank pin 15 to'act as a counter balance. tion engines and has for its object a compact The number of" slugs on the-metal usedmay light weight balanced crank shaft. j be'chosenso as to give the desired weight,

According to the invention, the crank shaft thereby permitting variatioinf Apertures 22 5 comprises a plurality of cheeks connected by and23 extending through the plates 11 "and 13 5 one or more crank pins to each of which is areprovided in the crank pins to decreasethe I attached one or more pitmen depending upon weight thereof and apertures 24 and 25 are the number of cylinders. Each end check of provided in the cheeks 11 and 12 for the'sa me' the crank shaft is provided with a groove to purpose. The faces of the cheeks 1'1' and 13 receive anti-friction members, the diameter are recessed to reduce furth r e W ig a of the bearing surface of the groove being the crank shaft. greater than the throw of the crank shaft. The'crank shaft is supported by'means of The crank shaft is supported b means of anti-friction members 26 interposed. between anti-friction members interposed between the the grooves 16 and 17 and grooves in race grooves in the cheeks and grooves in race members 27 and 27a which are supported in members mounted in the crank case. A collars28v projecting from. the ends of the counter weight is attached to each end plate crankcase of the engine, The race member opposite the crank pin. This arrangement al- 27 is held in place by means of a snap ring 29 lows the length and weight of the crank shaft which fits'in' cooperating grooves in they race 20 to be reduced to a. minimum and also reduces member27land its supporting-collar. I V V 7 the possibility of vibration in the shaft when A stud'30 projects from'the center of cheek rotating. I Y 13 into a hollow shaft'31 having a reduced One cheek is grooved to act as an oil reserportion extending through an aperture in the 0 voir and from it oil ducts lead to the crank wall of the crankcase. Anut 31a is threaded tons are lubricated. p to the wall. of the crank case. The open end Referring now to thedrawings, Fig.1 is a of shaft31 is closed by a plug32 rotatably I plan'view of a crank shaft embodying the inmounted therein and "having a portion 33 vention, V v I i threaded into the stud 30. Encircling the Fig. 2 is an end View, and g 1 v shaft 30'is a bushing34 in whichis" cut anoil Fig. 3 is an enlarged sectional view "of the groovei35. j p crank shaft showing its relation to other parts Integral with the shaft 31 is a gear 36 and of the engine. V mounted on the shaft is a cam sleeve 37 The crank shaft 10, which is disclosed having a'gear '38 integral therewithf Bethis application as adouble throw shaft, contween'the gear 36 and the gear 38 is intersists of three cheeks 11,12 and 13 which are po's'eda steel washer 39'1nounted'on the shaft connected by the crank pins 14 and 15. The 31. V

cheek 11 is provided with a groove 16 to re A second stud 40' projects from the cheek ceive, anti-friction bearings, the diameter of 13 at a point opposite the crank pin 15. On the bearing surface of the groove being great- 7 this shaft is mounted a double pinion 41haver than the throw of the crank shaft. -A ing-different diameter gears forming a part similar groove 17 is provided in thecheek 13. of a planetary gearing for drivingthe cam The cheek 11 has an extension opposite the sleeve37. The pinion 41- has one set ofteeth i5 crank pin 14 to form a sector 18in which are "meshing. with the gear 36 and the other set mounted metal slugs 19 or the like to act as a in mesh with gear 38. Between the two sets counter balance. The cheek 13 is extended of 'teeth'is a groove into which projects the to form a disc which is provided on its pewasher 39 to maintain the double pinion in riphery with teeth 20 adapted to mesh with proper relation to the gears 36 and38. The the pinion of a starting motor (not shown). stud'4O andpinion41 assist in counterbalancpins by means of which the cylinders and pisonto the reduced portion to clamp the shaft 75 i Slugs 21 are mounted in the disc 13 opposite ing the weight of the crank pin 15; In each 7 shaft, said pinion having one setof crank pin is provided a groove 42 to receive anti-friction members 43 which serve to mount one or more connecting rods on each crank pin.

The reduced portion of shaft 31 also passes through an aperture in the bottom of and serves. as aisupport for a cup-shaped member 44 which surrounds the cam sleeve 37. Tubular members 45 project from its wall to act as guides for tappet rods (not shown) engag: ing the cam sleeve 37.

The wall of the recess in theface-of thepate 13 is grooved to form an oil reservoir 4 through the crank pin to a duct 49in the cheek 12.. Ducts 50 and 51 lead from the duct 49 to the bearing grooves 42.011 the crank ms. t .'Oil is forced in theinterior of the shaft 31 through apertures 52by a pump (not shown). F rom= here it flows through the spiral groove in thebushing 34 from the end of which it flows onto the double pinion 41 and then finds itswayinto the oil well:47. It. then feeds along. the duct-48. to theduct 49, from which it is distributed to the crank .pin bearings through-the ducts .and 51. An. even distribution of oil to theconnecting rod bearings is thusobtained as the duct 49 acts as a reservoir from. which theoi-l flows :out in equal amountsto the bearingsthroughthe leads .50 and 51;

'tion as set forth in theappended claims.

I claim: 1. In. an internal combustlon' engine, a

crank case, a crank shaft having bearing surfaces of adiameter at least asgreatasth'ethrow. of the crank pin, a; shaft mounted on said crank casing, a. sleeve. rotatably mounted on said shaft, a gear formed on the end of said shaft, a. gear formed onsaid sleeve,

a.- stud shaft projecting from said crank shaft,; adoublepinion mounted on. said stud teeth in mesh, with each: of said gears. 7 I

2. In an. internal combustion engine, a crank -case,-.a crank shafthavingbearing surfaces o-f a diameteratrleast as great asv the throw. of the, crank. pin, a shaft mounted on said crank. casing, a sleeve rotatably mountedyon said shaft, a gearformed .on the end of said shaft, agear formed, on said sleeve, a

stud-shaft .projecti ngifrom said crank shaft,

From this reservoir a duct 48' extends a double pinion mounted on said stud shaft, said pinion havingone set of teeth in mesh with each of said gears, and a steel washer interposed between said gears and the two sets of teeth on said double pinion properly to position said double pinion relative to said gears. 7

3. In an internal combustion engine, a crank case, a crank shaft having bearing surfaces ofadiameter. atzleast as great as the throw of the crank pin, a shaft mounted on said crankcasing, a sleeve rotatably mounted onsa-id shaft, a gearcformedr on, the end of said shaft, a gear formed on said sleeve,

'a stud shaft projecting from said crank shaft, a. double pinion mounted on said stud shaft,said pinion having oneset-of teeth in mesh with each ofsaid gears, said stud shaft being positioned opposite the crank pin partly to counter-balance the Weight of said crank pin'. 4. In an internal combustion engine, 7 a crank shaft, a hollow member, a stud on said crank shaft projecting into said hollow'memher, a sleeve rotatably' mounted on said'member, gears integral with said member and said sleeve, a double pinionrotatably mounted, on said crankshaft, saidpinion having a groove between the sets of teeth, and a 'washer mounted on said member between said gears, said washer-projecting into said groove to position said double pinion i'nmesh with said gears. 7:

5. In an internal combustion engine, a crank case, a crankshaft having crank-pins and bearing membersof a diameter at least'as great as the throw of the crank pins, a hollow cylinder supported by said crank case, a gear formed on one end'of said cylinder, sleeve rotatably mounted on said cylinder, a gear formed on said sleeve, a stud shaft projecting 'from' said. crankshaft, a double pinion mounted on said shaft, said pinion having one set of teeth in mesh with each of'said gears, anaxial projection, from said crank shaft extending into said cylinder and having an oil groove, one of said bearing members having-an. internal groove adapted to receive oil from said first groove and said crank shaft having a .duct leading from said second groove to the periphery of-the crank plns; 7

6. In an internal combustion engine, a crank case, a crank shaft having crankpins and bearing members of a diameter at least as great as the throw of the crank pins, a hollow cylinder supported by said crank,- case, and an axial projection from said crank shaft extending. into 'said'cylinderand hav ing an oil groove, one of saidbearing members having. an internal groove adapted to receive oilfrom said first groove and said crank shaft having a ductleading from said second groove to the periphery of the crank pins.

.7. In combination, a shaft, a pair of gears mounted on said shaft in definite relation, a rotatable member coaxial with said shaft, a

counter shaft carried by said rotatable member, a double pinion on said counter shaft having one set of teeth in mesh with one of said gears and the other set of teeth in mesh with the other gear, and a washer interposed between said gears, said washer fitting in a groove in said pinion properly to position said pinion relative to said gears.

In testimony whereof, I have signed my name to this specification.

HUGH M. ROCKWELL. 

